JP3190721B2 - Overhead wire flaw detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead line flaw detector for checking whether or not an overhead line is damaged and the degree of damage while traveling on the overhead line.

[0002]

2. Description of the Related Art Overhead lines, such as overhead transmission lines and overhead ground lines, are susceptible to natural disasters such as snow and lightning. If there is a lightning strike on the transmission line, a part of the lightning will melt or the wire will melt. In addition, if the vibration is repeated by the wind, wire breakage due to fatigue occurs. Further, overhead wires may be corroded due to long-term exposure to the atmosphere. If such overhead wire damage is left unchecked, power transmission efficiency is reduced and noise due to corona discharge is increased, and in some cases, the transmission line may be broken. As a countermeasure, a transmission line or an overhead ground line is inspected for damage and its size and position are detected.

FIG. 2 is an external perspective view of a conventional overhead wire flaw detector used for the above-mentioned purpose. In the figure, a traveling machine main body 2 traveling on an overhead line 1 is provided with three traveling wheels 3 in a traveling direction. The traveling wheel 3 engages with the overhead wire 1 and rolls. A traveling motor 4 is provided to rotationally drive these traveling wheels 3. The traveling motor 4 and the traveling wheels 3 are connected by a chain or a gear (not shown) so that driving force is transmitted. Below the traveling machine main body 2, the traveling machine main body 2
And a traveling machine control unit 5 containing a circuit for processing a detection signal at the time of a flaw detection operation is suspended. In addition, a coil holding frame 6 for holding the flaw detection coil is disposed between the two traveling wheels 3 visible in the front of the figure. In FIG. 2, reference numeral 51 denotes a V-shaped mirror for enclosing the entire circumference of the overhead wire 1 within an angle of view of a camera (not shown) for photographing the outer surface of the overhead wire 1.

FIG. 3 shows a front view of such a coil holding frame portion. As shown in the figure, the coil holding frame 6 holds, for example, six flaw detection coils 7 at positions surrounding the overhead wire 1. The coil holding frame 6 is divided into two right and left sides by a plane passing through the axis of the overhead wire 1. Other configurations will be described later, and how to use the above overhead wire flaw detector will be described. FIG. 4 shows a schematic diagram of the operation state of the overhead wire inspection device. As shown in the figure, the overhead wire 1 is laid between the towers 11. The overhead wire flaw detector 10 is suspended from the overhead wire 1 so as to travel on the overhead wire 1. Worker 1
2 uses the remote controller 13 to remotely control the overhead line flaw detector 10. That is, when the worker 12 operates the switch of the remote controller 13,
The flaw detection operation of the overhead wire 1 is performed while moving the overhead wire flaw detector 10 forward or backward.

[0005] The overhead wire 1 is particularly liable to vibrate in a mountainous area or a place with complicated terrain. The vibration of the overhead wire 1 causes vibration fatigue as described above. As a preventive measure, for example, a stock bridge damper 14, a Christmas tree type damper 15, or the like is attached to the overhead wire 1. FIG. 5 shows a configuration diagram of the stock bridge damper. (A) of the figure is a front view of the stock bridge damper, and (b) is a side view thereof. As shown in the figure, the damper 14 is connected to the clamp 1 via an armor rod 1A for protecting the overhead wire 1.
It is suspended using 4A. This clamp 14A
A weight 14B is attached to the lower end of the left and right sides so as to spread both arms. In the stock bridge damper 14, the weight 14 </ b> B vibrates so as to cancel the vibration of the overhead wire 1 due to the wind, and exerts a vibration damping effect.

FIG. 6 shows the configuration of a Christmas tree type damper. (A) of the figure is a front view thereof, and (b) is a side view thereof. As shown in FIG. 3A, the damper 15 has an auxiliary wire 15B spanned between a pair of left and right clamps 15A. The auxiliary wire 15B vibrates so as to cancel the vibration of the overhead wire 1 and exerts a vibration damping effect. In addition,
The stock bridge damper 14 is mainly used for absorbing vertical vibration of the electric wire, and the Christmas tree type damper 15 is used for absorbing torsional vibration.
In addition to the above, various accessories such as a soft snow ring for preventing snow accretion are attached to the overhead wire. Therefore, when performing the flaw detection operation of the overhead wire 1 in the state shown in FIG. 4, a function of passing over such an obstacle and passing it is required.

[0007] Further, as shown in FIG.
Are arranged so as to surround the overhead line 1, and the overhead line 1
If a damper as shown in FIG. 5 or FIG. 6 is attached to the flaw detection coil 7, the flaw detection coil 7 collides with the damper and is damaged. Therefore, a configuration is adopted in which the opening / closing gear 16 is attached to the coil holding frame 6 shown in FIG. 3 and the coil holding frame 6 can be opened to the left and right around the support shaft 17. In the state shown in FIG. 3, the flaw detection coil 7 is connected to the overhead wire 1
In a state where a flaw detection operation is enabled, this is referred to as a flaw detection position. When avoiding an obstacle such as a damper attached to the overhead wire 1, the coil holding frame 6 is opened in a state as shown in FIG. That is, the opening / closing gear 1
6 rotates in the direction of arrow 18 to open the coil holding frame 6 left and right as shown in the figure. This state is called a retreat position.

As shown in FIG. 2, a first obstacle sensor 21 and a second obstacle sensor 21 are provided in front of the coil holding frame 6 of the traveling machine body 2 in order to detect an obstacle such as a damper as described above. Are mounted. A needle-like contact 21A is attached to the first obstacle sensor 21 vertically downward. The traveling machine body 2 travels in the direction of arrow 19. In this case, when the contact 21A comes into contact with an obstacle, a limit switch (not shown) operates and detects this. The detection signal is sent to the traveling machine control unit 5 to open the coil holding frame as described with reference to FIG.
The second obstacle sensor 22 is also provided for the same purpose, and a contact 22A protrudes substantially horizontally toward the lower side of the overhead wire 1 from this sensor. This contact 22
When A touches an obstacle, a limit switch (not shown) is operated. The first obstacle sensor 21 is mainly for detecting an obstacle protruding above the overhead line 1, and the second obstacle sensor 22 is for detecting an obstacle suspended on the overhead line 1. It is for doing.

FIG. 8 is a block diagram of a main part of a control circuit provided in the traveling machine control unit 5 shown in FIG. This circuit is provided with an opening / closing control circuit 26 and a flaw detection device control circuit 27. The opening / closing control circuit 26 is a circuit for controlling the frame opening / closing motor 25 that drives the opening / closing gear 16 of the coil holding frame 6 described in FIG. The opening / closing control circuit 26 is configured to receive the detection signal of the obstacle detection sensor 20 described above. This detection signal will be referred to as a frame opening command signal. Further, the remote controller 13 is provided with a forward key 13A, a retreat key 13B, a stop key 13C, and a flaw detection key 13D for controlling the overhead wire flaw detection apparatus 10 shown in FIG. An operator operates these keys to cause the overhead line flaw detector 10 to travel on the overhead line 1. The flaw detection device control circuit 2
Reference numeral 7 denotes a circuit for controlling various circuits of the flaw detection device (not shown) and for processing a detection signal and the like output from the flaw detection coil.

FIG. 9 shows an operation flowchart of the flaw detection apparatus as described above. In the figure, when the apparatus starts moving forward in step S1, the obstacle detection sensor described above performs an operation of detecting an obstacle (step S2). If no obstacle is detected, the apparatus moves forward and the flaw detection operation proceeds. On the other hand, if an obstacle is detected, the process moves from step S2 to step S3, and the advance of the device is stopped. And
In step S4, a frame opening command signal 20A is input from the obstacle detection sensor 20 shown in FIG. 8 to the opening / closing control circuit 26, and the frame opening / closing motor 25 is started. Thereby, the coil holding frame 6 is opened so as to move from the flaw detection position shown in FIG. 3 to the retracted position shown in FIG. After that, the worker
Is operated by operating the forward key 13A of the remote controller 13 shown in FIG.
6). After the device has passed the obstacle, the operator presses the stop key 1
3C to stop the advance of the device (Steps S7, S
8). Further, the operator operates the flaw detection key 13D (step S9). Thus, the opening / closing control circuit 26 drives the frame opening / closing motor 25 to return the coil holding frame to the flaw detection position (step S10). Thereafter, the operator operates the forward key 13A to advance the device, and starts the flaw detection operation again (steps S11 and S12). The V-type mirror 51 shown in FIG. 2 also receives a command signal from the obstacle detection sensor 20 in the same manner as the coil holding frame 6 and retreats to a predetermined position in order to avoid an obstacle. It is configured to return to the shooting position by operation.

[0011]

By the way, as described above, the running wheel 3 of the apparatus shown in FIG. 2 passes over the obstacle while the apparatus is passing the obstacle. For this reason, various vibrations are transmitted to the device. Therefore, the opening / closing control circuit 26 may malfunction for some reason, and the coil holding frame may be returned before completely passing the obstacle. Further, when the operator determines that the device has completely passed the obstacle and operates the flaw detection key 13D, a part of the obstacle may still be present below the coil holding frame 6. In such a case, FIG.
As shown in (1), the flaw detection coil 7 may collide with an obstacle such as the damper 14 and damage the flaw detection coil 7 and the coil holding frame 6. The same can be said for the V-shaped mirror 51. The present invention has been made by paying attention to the above points, and the invention according to claim 1 automatically returns the coil holding frame after the apparatus travels a predetermined traveling distance while passing through an obstacle. To prevent damage to the flaw detection coil
It is an object of the present invention to provide an overhead line flaw detector configured to automatically return a mirror to prevent breakage of the mirror.

[0012]

According to a first aspect of the present invention, there is provided an overhead wire flaw detection apparatus which performs a flaw detection of an overhead wire while traveling on an overhead wire to which an obstacle is attached , and the flaw detection coil is connected to the overhead wire. A coil holding frame that holds the surrounding position, a flaw detection position where the flaw detection coil approaches the overhead wire,
An opening and closing mechanism for opening and closing said coil holding frame to move to one of the retracted position away from the overhead wire in order to avoid the obstacle, the opening and closing control for controlling the opening and closing operation of the opening and closing mechanism
When the circuit and the coil holding frame are opened close to the obstacle , the subsequent traveling distance is measured and the vehicle passes the obstacle.
When traveling distance required to, to close the coil holding frame, it is characterized in that a travel distance measuring section for outputting a frame return command signal to the switching control circuit. The overhead line flaw detector according to claim 2 is a failure
Running an imaginary line which is attached the object, a mirror for accommodating the entire circumference of the overhead line in the angle of view of the camera for photographing an imaginary line, the photographing position and before approaching the mirror to the overhead line
A moving mechanism for moving the mirror so as to move the mirror to any of the retracted positions away from the overhead line to avoid the obstacle, a moving control circuit for controlling a moving operation of the moving mechanism,
When the mirror retreats to the evacuation position due to approaching an obstacle , measure the subsequent traveling distance and pass the obstacle
When traveling distance required to, so as to return the mirror to the photographing position, characterized in that a travel distance measuring unit for outputting the mirror return command signal to said movement control circuit is there.

[0013]

According to the first aspect of the present invention, the coil holding frame is opened.
After the device is passing through the obstacle, the travel distance running distance measuring unit measures. Then, if the mileage is measured just for the distance that passed the obstacle, the mileage measurement unit
Against the al switching control circuit, a frame return command signal is output.
As a result, the coil holding frame is closed only after the device has passed the obstacle and moved to a safe position, so
There is no risk of damage, such as Le. In the invention according to claim 2,
After the mirror is retracted, the device is passing through the obstacle, the row distance measuring section run the running distance is measured. Then, by a distance just past the obstacle when measuring the travel distance, run
Against the movement control circuit from the row distance measuring unit, the mirror return command signal is output. Thus, the mirror is returned only after the device has passed the obstacle and moved to a sufficiently safe position, so that there is no risk of damage or the like.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 is a schematic view of a main part showing an embodiment of an overhead line flaw detector of the present invention. The figure shows a front view of a coil holding frame portion of the flaw detector shown in FIG. 2 and a block diagram of a control circuit thereof. The illustrated coil holding frame 6 holds six flaw detection coils 7 so as to surround the overhead wire 1. Further, the coil holding frame 6 is divided into right and left by a plane passing through the axis of the overhead wire 1, and is configured to open and close left and right around the support shaft 17 by rotation of the open / close gear 16 in the direction of the arrow 18.

Further, a damper 1 fixed to the overhead wire 1
In order to detect an obstacle such as 4
Is provided. This configuration is as described above with reference to FIG. Further, an opening / closing control circuit 26 and a frame opening / closing motor 25 are provided for opening / closing control of the coil holding frame 6. The drive shaft of the frame opening / closing motor 25 is an opening / closing gear 1.
6. The device of the present invention is further provided with a traveling distance measuring unit 30 for measuring the traveling distance of the device. The traveling distance measuring unit 30 includes the traveling wheels 3
Is configured to receive the distance measurement signal from the rotation detection rotary encoder 31 provided in the controller. As will be described later, the mileage measuring unit measures a distance required for the device to pass through the obstacle while passing the obstacle, and opens and closes the frame return command signal 30A after passing the distance. It is a circuit that operates to output to the control circuit 26.

FIG. 11 is a specific circuit block diagram of the traveling distance measuring section as described above. In the figure, this device includes a counter 32 that calculates a count value based on a signal output from the rotary encoder 31, for example. This counter 32 has a set travel distance register 33 storing a count value corresponding to a preset travel distance.
Is connected. Further, the frame opening command signal 20A output from the obstacle detection sensor 20 shown in FIG. Further, there is provided a frame return command signal generation circuit 34 which receives the signal when the counter 32 reaches the count value "0".

That is, the counter 32 outputs the frame opening command signal 2
0A is received by the load terminal, and when the signal is input, a count value corresponding to the set traveling distance is loaded from the set traveling distance register 33. On the other hand, from the rotary encoder 31, a pulse corresponding to the rotation speed of the traveling wheel 3 shown in FIG. This pulse is 1
When the number is input, the counter 32 subtracts “1” from the loaded count value. Therefore, the rotary encoder 3
When the number of pulses corresponding to the count value loaded from 1 is input, the count value of the counter 32 becomes “0”. Further, when another pulse is input to the clock terminal, the borrow signal is output from the count zero output terminal because the count value is already “0”. This signal is input to the frame return command signal generation circuit 34,
A signal of a predetermined format for obtaining the frame return operation is output to the opening / closing control circuit 26 shown in FIG. The frame return command signal generation circuit 34 includes a register that holds a borrow signal output from the counter 32, a decoder that generates a frame return command signal of a predetermined format, and the like.
The above circuit is a general counting circuit, and various other well-known circuits can be used for distance measurement. The device of the present invention having the above configuration operates as follows.

FIG. 12 is a schematic explanatory diagram of the operation of the apparatus of the present invention. The device 50 of the present invention travels on the overhead line 1 in the direction of the arrow 35 in the figure, for example. In this case, when an obstacle 14 such as a damper is detected, the coil holding frame is automatically opened. Note that the coil holding frame 6 may be opened by a command from the ground. That is, the apparatus 50 performs the flaw detection operation up to the point A in the drawing, and thereafter, the apparatus stops the flaw detection operation, opens the coil holding frame, and enters an operation of passing through the obstacle 14 such as a damper. From this point A, the traveling distance measurement unit 30 described with reference to FIG. 11 starts measuring the traveling distance.
Then, when the vehicle travels a distance L sufficient for a preset obstacle such as a damper to pass, a frame return command signal is output in the manner described with reference to FIG. As a result, FIG.
The open / close control circuit 26 operates the frame opening / closing motor 25 to close the coil holding frame at the point B shown in FIG .
Thereafter, the device 50 starts running again from the point B in the direction of the arrow 35, and restarts the flaw detection operation.

The above operation is shown in a specific flowchart in FIG. As shown in FIG.
In, the device moves forward to perform a flaw detection operation. This is Figure 1
This is the operation up to the point A shown in FIG. Then, an obstacle is detected at the point A shown in FIG. 12 (step S2), and the running of the device is stopped in step S3. Step S
When the coil holding frame is opened in step 4 and it is determined in step S5 that the opening operation of the coil holding frame has been completed, the forward movement of the device is started again in step S6. Thereafter, in step S7, it is determined whether the apparatus has moved forward by the set distance L. When the device advances to the set distance L,
In step S8, the advance of the device is stopped. Then, in step S9, the closing operation of the coil holding frame is performed by the operation of the traveling distance measuring unit 30 described above. Thereafter, in step S10, the advance of the device is started,
The flaw detection operation is performed again. The opening / closing control circuit 26
After the opening operation of the coil holding frame 6, the traveling distance measuring unit 30
Unless the frame return command signal 30A is input from the controller, a malfunction that prevents the frame return operation can be performed, whereby the malfunction can be reliably prevented.

The present invention is not limited to the above embodiment. The traveling distance measurement unit 30 receives a signal for traveling distance detection from a rotary encoder 31 provided on the traveling wheel 3 and uses a counter to return a predetermined frame return command signal 30A.
Is output, but this may be replaced by various mechanisms for measuring the traveling distance of the device or an electrical device. Of course, the circuit configuration and the signal output configuration may be freely modified. Further, if the device is provided with a sensor capable of distinguishing the type of an obstacle such as a damper, the counter may be set in the counter for several types of traveling distances for passing according to the size of the obstacle. But it doesn't hurt. Further, an operator who operates the remote controller may specify the traveling distance when the coil holding frame is opened.

Further, in order to more reliably detect an obstacle during traveling, the second obstacle detection sensor 22 may be improved as shown in FIG. As shown in FIG.
The contact 22 </ b> B of the second obstacle detection sensor 22 has a configuration in which three needles extending in the horizontal direction are arranged apart from each other in the vertical direction. Thereby, accessories of various shapes suspended on the overhead wire 1 can be reliably and promptly detected. The arm 22C has both ends fixed to the contact 22B and the main body of the obstacle detection sensor 22. Thereby, even if a torsional force is applied to the contact 22B, it is possible to prevent the direction of the contact from changing. As shown in FIG. 15, the V-shaped mirror 51 also performs an obstacle avoiding operation similarly to the coil holding frame 6 of FIG. That is, when the obstacle detection sensor 20 shown in FIG. 1 detects the obstacle 14, the traveling of the device 50 stops, and the V-shaped mirror 51 in FIG. 15 moves to the retracted position shown by the solid line. Thereafter, when the device 50 moves forward by the set distance L, the device 50 stops again, and the V-type mirror 51 moves to the shooting position by the camera 52 as shown by the broken line in FIG. Thereafter, the device 50 starts moving forward again. The movement of the V-shaped mirror 51 is performed by a movement control circuit 53 having the same configuration as the opening / closing control circuit 26 and a movement motor 5.
4 is performed.

[0022]

As described above, according to the first aspect of the present invention, when the coil holding frame is opened to the retracted position to pass an obstacle attached to the overhead line while traveling on the overhead line. After that, the distance traveled by the device is detected, and after traveling the distance necessary for passing the obstacle, the coil holding frame is
Since the closing is performed, the work of confirming the passage of the obstacle is not required, so that the workability is improved, and the accident that the flaw detection coil collides with the obstacle by mistake and is damaged can be prevented. According to the second aspect of the present invention, while traveling on the overhead line, when the mirror is moved to the retracted position to pass an obstacle attached to the overhead line, thereafter, the distance traveled by the device is detected, The mirror is returned to the shooting position after traveling the necessary distance for obstacle passage, eliminating the need to check for obstacle passage, improving workability, and causing the mirror to accidentally collide with an obstacle. Accidents such as damage due to damage can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part showing an embodiment of an overhead line flaw detector according to the present invention.

FIG. 2 is an external perspective view of an overhead line flaw detector to which the present invention is applied.

FIG. 3 is a front view of a portion of a coil holding frame of the conventional overhead wire inspection device.

FIG. 4 is a schematic diagram of an operation state of the overhead wire inspection device.

FIG. 5 is a configuration diagram of a stock bridge damper.

FIG. 6 is a configuration diagram of a Christmas tree type damper.

FIG. 7 is a front view of a coil holding frame portion in a retracted position.

FIG. 8 is a block diagram of a main part of a control circuit of the flaw detector.

FIG. 9 is an obstacle passing operation flowchart.

FIG. 10 is a front view of a portion of a coil holding frame when a malfunction occurs.

FIG. 11 is a detailed block diagram showing an embodiment of a traveling distance measuring unit.

FIG. 12 is a schematic operation explanatory view of the device of the present invention.

FIG. 13 is a specific operation flowchart of the device of the present invention.

FIG. 14 is a perspective view of a main part of the obstacle detection sensor.

FIG. 15 is a partial front view of the mirror for explaining the retracting operation of the photographing mirror.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Overhead wire 6 Coil holding frame 7 Inspection coil 14 Damper (obstacle) 16 Opening / closing gear 20 Obstacle detection sensor 26 Opening / closing control circuit 25 Frame opening / closing motor 30 Traveling distance measuring unit 30A Frame return command signal

Continuation of the front page (72) Inventor Toshio Sugano 2-1-1, Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Mizuo Kiuchi 2-1-1, Ei Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Inside Showa Electric Wire & Cable Co., Ltd. (56) References JP-A-2-257054 (JP, A) JP-A-63-234150 (JP, A) JP-A-4-38462 (JP, A) −146754 (JP, U) Actually open 62-1225311 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 21/84-21/958 G01N 27/72-27/90 H02G 1/02 315

Claims (2)

(57) [Claims] 1. A flaw detection coil for detecting a flaw of an overhead wire while traveling on an overhead wire to which an obstacle is attached; a coil holding frame for holding the flaw detection coil at a position surrounding the overhead wire; wherein the flaw detection position close to the overhead wire
Opening and closing the coil holding frame to move it to one of the retracted positions away from the overhead line to avoid obstacles
A mechanism , an opening and closing control circuit for controlling the opening and closing operation of the opening and closing mechanism, and when the coil holding frame is opened close to the obstacle ,
After that, measure the mileage and pass the obstacle.
When running the required distance, close the coil holding frame
That way, overhead line flaw detection apparatus characterized by comprising a traveling distance measuring unit that outputs a frame return command signal to the switching control circuit. 2. A mirror for enclosing the entire circumference of the overhead line within an angle of view of a camera for photographing the overhead line while traveling on an overhead line to which an obstacle is attached , and photographing the mirror close to the overhead line. Location and the obstacles
A moving mechanism for moving the mirror so as to move the mirror to any of the retracted positions away from the overhead line in order to avoid an object, a moving control circuit for controlling the moving operation of the moving mechanism, and the mirror approaching an obstacle in when retracted to the retracted position, to measure the subsequent travel distance, it passes through the obstacle
When traveling distance required to, so as to return the mirror to the photographing position, the overhead wire, characterized in that a travel distance measuring unit for outputting the mirror return command signal to said movement control circuit Flaw detector.